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Technical Documents

One of NFRC's main functions is to promulgate technical standards that establish uniform procedures for determining the various energy performance ratings: including U-factor, Solar Heat Gain Coefficient (SHGC), Visible Transmittance (VT), and Condensation Resistance.

2014 (Current Document Cycle) - Revised April 2014

NFRC 2014 documents have been approved by NFRC membership and The Board of Directors for publication. Implementation date for 2014 rating system was April 2014.

For NFRC Certification of fenestration products, either WINDOW5/THERM5 or WINDOW6/THERM6 may be used for the simulation of those products. However, after July 1, 2011 only WINDOW6/THERM6 will be authorized for NFRC Certification.